Brake for motion picture apparatus



April 7 9, 1935. J. STOIBER BRAKE FOR MOTION PICTURE APPARATUS Filed Jill 13, 1952 Josqplv/fli'ozlber,

Zlwuentor:

- a a. MM%.

Patented Apr. 9, 1935 UNITED STATESPATENT OFFICE; T 1,997,321 t I BRAKE FOR MOTION PICTURE APPARATUS Jos'eph Stoiber; Rochester, N. Y Q, assignor Eastman Kodak Company, Rochester, N Y., a.

o 'poration of New York, 7 v H Application Julyz13, 1932, SerialrNo. 622,286 v e 12 Ch me (ol. ra s-ts The present invention relates to a brakefor the'camera-parts and taken on the line l--l of' motion picture apparatus,"and more particular- Fig. 2 r l ly to a brake which is only selectively applied to Fig, 2 is'a fragmentary, plan viewof the camthe speed responsive means of a high speed camera according to the invention showing the gov era, V ernor; adjustable means for setting the governor I The various mechanisms within a high speed speed and the brake means 'for engaging the fricmotion picture camera for photographing slow 9 u ac f he gov rnor. V r motion pictures are subjected to considerable F 3 is e y, t a sverse, Vertical 2' train and wear during operation of the camera, CIOSS SGCtiOIl through the camera illustrating the but such mechanisms are placed under more se- Cooperation the brake member With the fric- .1 Vere strain when'they are suddenly stopped after tion Surface of the govern k n on the rotating at high speeds. Certain mechanisms n of Fig; l r r of t camera my be driven through Qver-run In the illustrated embodiment of the invenning clutches so that themechanical inertia to tioh, the camera a isms are all mounted on j 16 be overcome by the motorrelease is somewhatree. between the h s p t s III and II. A

duced but the remainder of the mechanisms are governor S a I2 is J'ollrnaled'at each end in" still subjected to terrific strains when the 'cammechanism Plates ll Bind I A c01lar:l3 is lois operated t t highest speeds am} t cated on governor shaft l2and is fastened theresuddenly brought to a complete'stop} to b e n A a 5 is also mounted-to turn :The primary object of the presentinvention is W n? Shaft ahmeshet with 86a 20 the provision of a brake means or brake member which constitutes'an element in -r tr in within a met-ion picture camera is operato be described later. A'second 001181 6 i5 10 tive only when it is desired'to stop 'the'camera cated 119011 the other end of governor h 7 andonly when the a is operating above to rotate therewith but axially slidable thereon, a normal speeds. pin 1 iri ollar' Ili'engaging a slot It! in governor 25 Another object of: the invention is the'provi- Shaft I2 for this purpose -A v rn k I9 is sion f tb' k b r hi h cooperates t attached to collar l6'to turn with shaft I! but. the camera, release prevent engag'ementof then also axially slidable V thereon. VA plurality"). Of release and stopping of the camera'until the ro-' Weight members 20 are p o ly linked between tativevspeed of t camera a been reduced to collar 13 and collar It by mean'sof a plurality of 30 or below a predetermined value. r h t p e e Otherobjects of the invention will be suggest- A splmg m n for normally movin ollars l3 ed tothose skilled in the art as the description of w y j m a h other, encirclesgovernor my invention is developed hereinafter. Shaft and 15 Preferably pos d 0 alight The several objects of the invention are at 0011 Spring 22 and a he v 00i1 p g 3 Separated 35 tained by the provision of a brake member which by a Washer e w h e circles governor is adapted frictionally to engage a friction surshaft The splmg meanhemployed may be of face assuming positions corresponding to the roany knQwn'form may e er t orms distative speeds of a speed responsive means, said closed y copehdlng pplication Serial No.

40 brake member being adapted to engage thefric- 20,189, filed June 30, 1932, fora centrifugal-gov- 40 7 tionsurface only in positions corresponding to l for a motion p c repam n-w i ep. speeds above a predetermined value and only'to plication the advantages and performance of such retard the speed responsive means. The brake a Spring m an ar explained. e member cooperates with astop means for stopping A a e ns of known form and function'is the camera upon engagement and insuch a manprovided for the purpose of determining the 'gov- 45 ner that said stop means'cannot become 'enernor speed and cooperates with an adjustable gaged during operation of the camera above a means for varying the setting of said. brake means. predetermined speed. a e 4, V A brake arm 25 is pivotally mounted on a bracket Reference is hereby made to the accompanying 26 on mechanism plate I! by means of belt 2 1].

drawing in the several figures ofwhich similar A brake shoe: 28 composed of leather, cork or elements are designated by similar reference nuother suitable friction material, is fastened to merals and in which: p 11R l p one end of brake arm 25 and is adapted fric- Fig. l is a vertical, longitudinal cross section tionally to engage one surface of governor of the camera mechanism 'accordingto the in- Ill. The aforementionedadjustable-means'com-l k ventionprimarily illustrating a side elevation of prises a threaded stem 29 which has ahead piece 36 is located on. mechanism plate lll anda pro: -jection'31 is positioned upon dial 3'! so that more than a-single rotation of dial 3| is not possible.

The outer surfaces of dial 3| and camera casing" 34 may be'provided with spitable'marks or gradj nations to indicate the setting of" the adjusting means and the correspondingfspeedfof'the; gov j ernor or camera. The driving powerfor thecam j era may be an electric motor or a spring motor, the latter being preferred. Smcl'r'a .primeml ive'r is not shown in the drawing but drives a. large pinion gear 38 mounted upon a shaft 33which'is rotatablymounted. between, mechanism plates: Hi and H. Another shaft 49 supports a small gear 4lmeshing-with large pinion gear 38- and also supports gear-l5 which meshes with and drives gcarl-.5;ongovernorshaft l;2.: p i, 1 :Alstop means. which isadapted upon engagement to stop the camerazimechanismwillnextbe described A toothed meanssuch as a single toothed gear 42, isattached toshaft 4:3 which also carries a smallgearsll mesh'with the largepi-nion. gear. 38,. Thestoothedimeans comprises one element of the stop means, while-"the other element of thestop-means is constituted primarily by apawl 4R; Pawl 4:5 is rotatahly mounted on a. shaft .45..and has a toothA'l: which is adapted to engage the single toothed-gear 42. Anngenpiece 48*135 pivotallyconnected. to pawl 45' and extends to the exterior of the-camera for-movement by the operator :of zthec'amera; -A coil, spring? encir l s shafttwand. has oneend. attached to mechanism plate H and the other end engagi g a pin 50 on pawlflfi' so; that pawl tiisnormallyheld in engagement with the single toothed. gear 42.

he amera me hanism: thus far d scribed, xceptethezspring means in the governor, is oi convention-al; form; and design. Thegfrictionsurface or the governor a sumes .vvarioussnos i ns c n. responding to the setting of the adiusting means andtothe speed'ofrotation of the. governor or 1 speed .Whileth e setting of brake arzxrfla';

the strength of the spring means between collars l3 and.l 6,. and1thecentrifugal forces createdin theweight-members ZE'upon rotation of the: shaft; it all contributeto the. position assmnediby governor diskfiaitis deemed. accurate toascribe this location of the'friction surface to thespeed responsive means orthegovernor;

The brake means; which constitu-tes-the essence of thepresentinvention will now be described.

Such a brake'mea-ns includesa brake member which is located adjacent the. friction'surface of the speeduesponsive mean and which is" actu ated by one element "o'f'the stop means. 1 specifically the brake arm 5|.is pivotally mounted upon a 'pin52 supported by'ajbjrack'et, 53 which isattached to'mechanismf plate H. Brak'eiarm 5T isliintermediatelypivoted'tc pin'52 and is provided on one end; with a brake fs hoe' inadeof suitablejfiictionnraterialand. at the other. end is ri eal c ie e a s a; he: ink is s se ivqta liia o n c ed p a -4.5 wh c the. .fermf fa l. crank. Th brake "5 l; nerat d hy the pawl m mb oithest n m an amlzi r tum controls; the op ration oi t e pawl:

member in a manner more fully explained hereinafter. 7 It is conventional and satisfactory to stop abruptly a camera mechanism which is only operating at normal speed or IE frames per second. As. before stated, however, the various parts of the camera are severely strained when halted abruptly after operating at speeds greater than normal speed; suchias 32, 48 136,6! frames per second. Referring to Fig.3; the position as- ..sumed by the friction surface of governor disk l9 when the camera mechanism is stationary is illustrate'd'infull lines and by the letter S. The position assumed by the friction surface of governor disk fsduring operation of the camera at normal speed i's indicated by the dashed lines and the letter N. The position of the friction surface ofgovernor-disk l9 during high speed S, N, or intermediate The moment of brake arm 5| about pin 52 takes place when; the pawl lii'of the stop means is moved to releasetthe single toothed. gear 42... In other words, 7

when. finger piece 4* is pressed inwardly, pawl i5 is rotated aboutv shaft 4.6 and link 551swings; brake arm. 5 t into the position indicated hydotted lines in Fig. 3. E ven tlimughz'the speed. responsive-'mea ns or'governor is set at high speeds,v the: brake shoe.- Mxon'brake'ann iliwill not engage the friction surface nidisk [:9 at this timeibecause the speed responsive mans-will not have had sufiicientopportunity. to sum the speed carre spending totthe setting and thecfriction" surface will vnotrhzwe assumed its corresponding position. 7 Assuming. now'that the camera is operating. at a speed'a-hore therpredeterminedrvame or' normal speed of .16; frames per second. upon release at fingerzpiecefl the'brake. arm it. will be: permittedto engage the'rriction' surface to retard the rotative speed of. the speed responsive means and this frictional engagement will continue until'thespeede responsive means has. been retarded to normal speed-aniline friction surface or governor tS has heensmaved to the positionN. During the frictional .engagement'betweenbrake arm: 5i: and the friction surface at the speed responsive the-pawl 4511f. the stop means is heldoutcf engagement .witl'r the single toothed gear and-.in the, position indicated by. dotted lines iniFig. 1. ell-that the stop means cannot became;- engaged to stop the camera mechanism until ithas been retarded. to normal speed. The coil spring && performs a dual formation, at such a; time ,1 first it urges the brake shoe 54 on brake arm 5-,! into frictional engagement with the: friction surface ofjthe, .speedgresponsive means'and it also urges t awl 4-5 to rotate about shaft {EB-tending to; cause teeth 41 on. pawl $5 to engageqthe singletoothedgeal' $2 1 I ..Si n;ce many .modifications. of. the present irrvention arezpossible. without departing from the spirit. orscope of; the invention, the: present dis-r closureiisjtoheconstrueds man illustrative and not in a limiting sense. y y Having now particularly deszribed my invenwhat I' desire tosecure. by LettersPatent at the Unitedzstatesi andwhatl claim-ism.

1. In a device of the character described, the combination with a speed responsive meana ineluding a; surface. movable. to. positions corresponding. .to. the-.a-rotativet speed ofcsaid I as.

means, and a stop means adapted upon engagement to stop said device, of a brake member movable by said stop means into and out of engaging position with respect to said surface and arranged to leave said engaging position before engagement of said stop means.

2. In a device of thecharacter described, the combination with a speed responsive means including a surface movable to Various positions corresponding to the rotative speed of said means, and a stop means adapted upon engage ment to stop said device, of, a brake member movable by said stop means into and out of engaging position with respect to said surface and cluding a surface movable to various positions corresponding to the rotative" speed of said means, and a stop means adapted upon'engagement to stop said device, of a brake 'member movable by said stop means into and out of engaging position with respect to said surface and arranged to engage said surface only in those positions of said surface which correspond to speeds of. said speed responsive means in excess of a predetermined speed and to prevent engagement of the stop means during such engagement with said surface. a r

4. In a device of the character described, the combination with a centrifugal governor provided with a friction surface adapted to assume a posi tion corresponding to the rotative speed of said governor, and astop means adapted upon engagement to stop said device, of a brake means moved by said stop means and for selectively engaging the friction surface of said governor.

5. In a device of the character described, the combination with a centrifugal governor provided with a friction surface adapted to assume a position corresponding to therotative speed of said governor, and a'stop means adapted upon engagement to stop said device, of a brake member actuated by said stop means and adapted frictionally-to engage said friction surface, only in a position of said surface correspondingto rotation of said governor above a predetermined speed.

6. In a device of the character described, the combination with a centrifugal governor including a disk axially movable and adapted to assume a position corresponding to the speed of rotation of said governor, and a stop means adapted upon engagement to stop said device, of a brake member moved by said stop means and adapted frictionally to engage said disk only in a position 00-. cupied by said disk corresponding to rotation of said governor above a predetermined speed.

'7. In a device of the character described, the combination with a centrifugal governor provided with a friction surface adapted to assume a position corresponding to the rotative speed of said governor anda stop means adapted upon engagement to stop said device, of a brake member associated with said stop means, adapted frictionally to engage said surface and to prevent engage ment of said stop means only in those positions of the friction surface corresponding to high governor speeds.

mined value.

8. In a device of the character described, the combination with a centrifugal governor provided with a friction surface adapted to assume a-po'sition corresponding to the rotative speed of said governor, and a. stop means adapted upon engagement to stop said device, of a brake member associated with said stop means and adapted frictionally to engage said friction surface in positions of said-surface corresponding to governor speeds above a predetermined speed, said friction surface also preventing engagement of said [stop means during governor speeds above said predetermined speed. c

9. In a device of the character described, the combination with a centrifugal governor provided with a surface adapted to assume a position corresponding to the rotative speed of said governor,

and a stop means adapted upon engagement to stop said device, of a brake member moved'by said stop means and adapted frictionally'to engage said surface only in those positions of said surface corresponding to rotation of said governor above a predetermined speed, and a resilient means normally moving said stop means into engagement and normally moving said brake member into position for engagement with said surface.

19. In a device of the character described, the

combination with afriction disk, a centrifugal governor controlling the position of saiddisk ac cording to the rotative speed of said governor, and a stop means adapted upon engagement to stop said device, of a brake member swung in an arcuate path by said stop means and adapted frictionally to engage said friction disk just prior to the engagement of said stop means if said governor is rotating at a speed in excess of a predeter- 11. In a'device of the'character described, the

combinationwith a frictionldisk, a centrifugal governor controlling the position'of said disk according to the rotative speed of said governor, a toothed means geared to said governor and a pawl adapted to engage said toothed means and to stop said device, of a brake member linked to said pawl and adapted frictionally to engage said disk if said governor is rotating. at a speed in excessof a predetermined value, said pawl being prevented from engaging said toothed means while said brake member is in frictional engagement with said disk. V

12. In a device of the character described, the, combination with a friction disk, a centrifugal governor controlling the position of said disk according to therotative speed of said governor, a toothed means geared to saidgovernor and a pawl adapted to engage said toothed means and to stop said device, of a brake member linked to said pawl and adapted frictionally to engage said disk if said governor is rotating at a speed in excess of a predetermined value, said pawl being prevented from engaging said' toothed means while said brake member is in frictional engagement with said disk,

and a spring normally urging said pawl into engagement with said toothed means and adapted 

